[dmarc-discuss] dmarc-discuss Digest, Vol 19, Issue 3

Franck Martin fmartin at linkedin.com
Tue Jul 16 09:58:34 PDT 2013

Multiple From: headers is invalid per RFC. There must be one and one only From: header in all emails. Most MTAs do not care. If you deploy DMARC I strongly suggest you do that check and bounce.

What we are talking is multiple emails in the From: header, which is valid as per RFC

On Jul 16, 2013, at 9:47 AM, Tim Starr <tim.starr at sendgrid.com> wrote:

> I've seen multiple Froms in the wild, but only in error, and the only
> way I found them was in Gmail bounces, citing the RFC as saying they
> were invalid. So, Gmail at least seems to take the position that
> nothing should be sent with multiple Froms. Does anyone else actually
> treat them as valid?

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